/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/Image.h
Mipmap separating the worst case treatment in 3 steps to manage allocations of temp data.
void ImageMipmap_PrepareScratch ( [Image](API\Plugins\MutableRuntime\MuR\Image) * Dest, const [Image](API\Plugins\MutableRuntime\MuR\Image) * Base, int32 LevelCount, [FScratchImageMipmap](API\Plugins\MutableRuntime\MuR\FImageOperator\FScratchImageMipmap) & )